We have the Melissa & Doug easel. It's wooden, very sturdy, and has a rod in the center of the easel that you can put a paper roll on...so most of the time the whiteboard side is actually a "paper" side and we use crayons and paint on it. DD also loves the chalkboard side. Every time we have guests, it's about 20 minutes into the visit before an adult is drawing on the easel with DD...so I think it was a good purchase for us. I also like that you can resituate the trays to the top if, like DD, your LO likes to try to sit/stand/climb on them.
We buy the $5 paper roll from Ikea and use it. If I had it to do over, I'd just buy the Ikea easel, probably!